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/*!
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* Lunr languages, `Japanese` language
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* https://github.com/MihaiValentin/lunr-languages
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*
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* Copyright 2014, Chad Liu
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* http://www.mozilla.org/MPL/
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*/
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/*!
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* based on
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* Snowball JavaScript Library v0.3
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* http://code.google.com/p/urim/
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* http://snowball.tartarus.org/
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*
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* Copyright 2010, Oleg Mazko
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* http://www.mozilla.org/MPL/
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*/
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/**
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* export the module via AMD, CommonJS or as a browser global
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* Export code from https://github.com/umdjs/umd/blob/master/returnExports.js
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*/
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(function(root, factory) {
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if (typeof define === 'function' && define.amd) {
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// AMD. Register as an anonymous module.
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define(factory)
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} else if (typeof exports === 'object') {
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/**
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* Node. Does not work with strict CommonJS, but
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* only CommonJS-like environments that support module.exports,
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* like Node.
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*/
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module.exports = factory()
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} else {
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// Browser globals (root is window)
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factory()(root.lunr);
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}
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}(this, function() {
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/**
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* Just return a value to define the module export.
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* This example returns an object, but the module
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* can return a function as the exported value.
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*/
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return function(lunr) {
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/* throw error if lunr is not yet included */
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if ('undefined' === typeof lunr) {
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throw new Error('Lunr is not present. Please include / require Lunr before this script.');
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}
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/* throw error if lunr stemmer support is not yet included */
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if ('undefined' === typeof lunr.stemmerSupport) {
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throw new Error('Lunr stemmer support is not present. Please include / require Lunr stemmer support before this script.');
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}
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/*
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Japanese tokenization is trickier, since it does not
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take into account spaces.
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Since the tokenization function is represented different
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internally for each of the Lunr versions, this had to be done
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in order to try to try to pick the best way of doing this based
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on the Lunr version
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*/
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var isLunr2 = lunr.version[0] == "2";
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/* register specific locale function */
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lunr.ja = function() {
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this.pipeline.reset();
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this.pipeline.add(
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lunr.ja.trimmer,
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lunr.ja.stopWordFilter,
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lunr.ja.stemmer
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);
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// change the tokenizer for japanese one
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if (isLunr2) { // for lunr version 2.0.0
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this.tokenizer = lunr.ja.tokenizer;
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} else {
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if (lunr.tokenizer) { // for lunr version 0.6.0
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lunr.tokenizer = lunr.ja.tokenizer;
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}
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if (this.tokenizerFn) { // for lunr version 0.7.0 -> 1.0.0
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this.tokenizerFn = lunr.ja.tokenizer;
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}
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}
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};
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var segmenter = new lunr.TinySegmenter(); // インスタンス生成
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lunr.ja.tokenizer = function(obj) {
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var i;
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var str;
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var len;
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var segs;
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var tokens;
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var char;
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var sliceLength;
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var sliceStart;
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var sliceEnd;
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var segStart;
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if (!arguments.length || obj == null || obj == undefined)
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return [];
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if (Array.isArray(obj)) {
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return obj.map(
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function(t) {
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return isLunr2 ? new lunr.Token(t.toLowerCase()) : t.toLowerCase();
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}
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);
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}
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str = obj.toString().toLowerCase().replace(/^\s+/, '');
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for (i = str.length - 1; i >= 0; i--) {
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if (/\S/.test(str.charAt(i))) {
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str = str.substring(0, i + 1);
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break;
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}
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}
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tokens = [];
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len = str.length;
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for (sliceEnd = 0, sliceStart = 0; sliceEnd <= len; sliceEnd++) {
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char = str.charAt(sliceEnd);
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sliceLength = sliceEnd - sliceStart;
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if ((char.match(/\s/) || sliceEnd == len)) {
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if (sliceLength > 0) {
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segs = segmenter.segment(str.slice(sliceStart, sliceEnd)).filter(
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function(token) {
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return !!token;
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}
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);
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segStart = sliceStart;
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for (i = 0; i < segs.length; i++) {
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if (isLunr2) {
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tokens.push(
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new lunr.Token(
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segs[i], {
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position: [segStart, segs[i].length],
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index: tokens.length
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}
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)
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);
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} else {
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tokens.push(segs[i]);
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}
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segStart += segs[i].length;
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}
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}
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sliceStart = sliceEnd + 1;
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}
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}
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return tokens;
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}
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/* lunr stemmer function */
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lunr.ja.stemmer = (function() {
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/* TODO japanese stemmer */
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return function(word) {
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return word;
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}
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})();
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lunr.Pipeline.registerFunction(lunr.ja.stemmer, 'stemmer-ja');
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/* lunr trimmer function */
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lunr.ja.wordCharacters = "一二三四五六七八九十百千万億兆一-龠々〆ヵヶぁ-んァ-ヴーア-ン゙a-zA-Za-zA-Z0-90-9";
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lunr.ja.trimmer = lunr.trimmerSupport.generateTrimmer(lunr.ja.wordCharacters);
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lunr.Pipeline.registerFunction(lunr.ja.trimmer, 'trimmer-ja');
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/* lunr stop word filter. see http://www.ranks.nl/stopwords/japanese */
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lunr.ja.stopWordFilter = lunr.generateStopWordFilter(
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'これ それ あれ この その あの ここ そこ あそこ こちら どこ だれ なに なん 何 私 貴方 貴方方 我々 私達 あの人 あのかた 彼女 彼 です あります おります います は が の に を で え から まで より も どの と し それで しかし'.split(' '));
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lunr.Pipeline.registerFunction(lunr.ja.stopWordFilter, 'stopWordFilter-ja');
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// alias ja => jp for backward-compatibility.
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// jp is the country code, while ja is the language code
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// a new lunr.ja.js has been created, but in order to
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// keep the backward compatibility, we'll leave the lunr.jp.js
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// here for a while, and just make it use the new lunr.ja.js
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lunr.jp = lunr.ja;
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lunr.Pipeline.registerFunction(lunr.jp.stemmer, 'stemmer-jp');
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lunr.Pipeline.registerFunction(lunr.jp.trimmer, 'trimmer-jp');
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lunr.Pipeline.registerFunction(lunr.jp.stopWordFilter, 'stopWordFilter-jp');
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};
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}))
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